dd-trace/packages/dd-trace/src/profiling/profilers/event_plugins/dns_resolve.js

Datadog APM tracing client for JavaScript

'use strict'

const DNSPlugin = require('./dns')

const queryNames = new Map()

class DNSResolvePlugin extends DNSPlugin {
  static operation = 'resolve'

  extendEvent (event, startEvent) {
    const rrtype = startEvent.args[1]
    let name = queryNames.get(rrtype)
    if (!name) {
      name = `query${rrtype}`
      queryNames.set(rrtype, name)
    }
    event.name = name
    event.detail = { host: startEvent.args[0] }

    return event
  }
}

module.exports = DNSResolvePlugin